Effect of the Arrangement for Grid Spacers with Mixing Vanes on the Thermal Hydraulic Characteristics of a 5×5 Rod Bundle via CFD Analysis
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摘要: 为探究棒束通道定位格架的最优排布方式，本文采用计算流体动力学（CFD）方法对包含3个格架部件的5×5棒束通道进行流场和温度场的数值仿真，研究格架轴向间距以及格架相对转角对通道阻力和传热特性的影响，并从对流传热的角度分析造成不同结果的原因。研究表明，在本文设计的计算工况下，改变格架轴向间距对棒束阻力和传热特性的影响较小；将中间格架在横截面内相对两端格架旋转90°放置能够有效降低横截面温度分布的不均匀性，减小横截面最高温度。
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关键词:
- 计算流体动力学（CFD） /
- 定位格架 /
- 5×5棒束通道
Abstract: In order to optimize the arrangement of the grid spacer for a rod bundle, the computational fluid dynamics (CFD) method is employed to analyze the flow and temperature fields for a 5×5 rod bundle equipped with three grid spacers. The effect of the axial separation between two neighboring grid spacers and the relative rotation angle of the grid spacer is investigated, and the reasons for different results are analyzed from the perspective of convective heat transfer. It is found that the variation of axial separation brings negligible change on the drag and heat-transfer characteristics of the rod bundle. However, rotating the middle grid by 90° relative to the grids at both ends in the cross section can effectively reduce the non-uniformity of temperature distribution in the cross section and reduce the maximum temperature in the cross section.-
Key words:
- CFD /
- Grid spacer /
- 5×5 rod bundle
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图 2 定位格架俯视图与冷热棒分布
Figure 2. Top View of Grid Spacers and Arrangement of Cold and Hot Rods
图 3 采用不同密度网格计算得到的平均压力随着z的变化（Ⅰ型格架段）
Figure 3. Variation of Average Pressure Calculated with Different Grid Meshes with z (TypeⅠ Grid Spacer Section)
图 4 格架间距和相对转角示意图
Figure 4. Schematic Diagram of Separation Distance and the Relative Rotation Angle for Grid Spacers
图 5 格架轴向间距对流动和传热特性的影响
图中竖线表示格架中心位置
Figure 5. Effect of the Axial Separation for Grid Spacers on Flow and Heat Transfer Characteristics
图 6 跨间格架相对转角对流动和传热特性的影响
图中竖线表示格架中心位置
Figure 6. Effect of Relative Rotation Angle for Middle Grid Spacer on Flow and Heat Transfer Characteristics
图 7 工况3和工况6中间格架下游65 mm截面横流速度矢量和温度分布
Figure 7. Cross-flow Velocity Vector and Temperature Distribution at 65 mm Cross-section Downstream of Middle Grid Spacer for Cases 3 and 6
图 9 工况3和工况6四个分区平均温度随着轴向位置的变化趋势
Figure 9. Variation of Average Temperatures of 4 Quarters with Axial Position for Cases 3 and 6
表 1 计算工况参数表
Table 1. Parameters for CFD Cases
工况 D/mm R 1 179.5 0° 2 229.5 0° 3 279.5 0° 4 329.5 0° 5 379.5 0° 6 279.5 90° 
下载: 导出CSV
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